JPH11315866A - Brake system for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake system for a bicycle, which is inexpensive, simple in structure, powerful in braking force, high in reliability and is easy to be assembled and maintained. SOLUTION: This system is equipped with a disc mounted in a floating condition with respect to a hub, and a brake unit 15 mounted in a floating condition with respect to forks. When a brake is applied, a hollow member 32 is rotated as a control lever 20 is rotated, and the rolling of a cam part 35 over a roller 34 allows an outside brake lining 37 to be moved to the direction that the disc is disposed thereto. In this case, the assembly of the brake unit 15 with the disc allows pressure to be applied to the disc by means of the outer side brake lining 37, and the inner side brake lining 40 which is fixed and disposed thereto, so that the brake is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake system provided on a bicycle by mechanical action, and more particularly to a disc brake system suitable for a mountain bike or an on-road racing bicycle. is there.

[0002]

2. Description of the Related Art At present, most disc brake systems for bicycles on the market employ a system in which a brake lining is pressed against a disc by hydraulic pressure. A widely known configuration of the hydraulic disc brake system includes a caliper provided in a fixed state, and the caliper includes two pistons arranged to face each other. The two pistons perform a braking operation by pressing the brake lining against the disc by the action of hydraulic pressure.

[0003]

As described above, the hydraulic disc brake system has a very complicated structure and does not cause unnecessary friction between the brake lining and the disc during non-braking. , Must be very accurately assembled.

When a hydraulic disc brake system is mounted, it is necessary to replace a normal brake lever mounted on the handlebar with a lever of a type suitable for the hydraulic system.

[0005] Heavy use of the brakes also causes overheating of the hydraulic system, which can result in poor braking and damage to the hydraulic system.

In the case of such a hydraulic system, the user needs to frequently release air from the hydraulic tube and replenish the liquid to maintain an appropriate amount of liquid. These tasks are difficult tasks even for professional mechanics.

As can be seen from the above, the hydraulic disc brake system has disadvantages such as high cost, poor high-temperature durability, and complicated installation and maintenance operations. ing.

[0008] These drawbacks have been partially overcome by a combined hydraulic and mechanical brake system. In this combined brake system, as a widely known configuration, the caliper operates by hydraulic pressure, and the operation of the caliper is performed by a cable connected to a normal lever provided on a handlebar. I have. The caliper is installed in a floating state with respect to a front or rear fork by a fixing pin. This is to allow the caliper to return to the center position naturally during braking. Braking is performed by extruding one small piston on the caliper that acts to press the lining against the disc. According to this system, it is possible to eliminate the friction caused by the deviation in the adjustment of the position and the lining not returning completely to the non-contact position.

[0009] However, this composite brake system has a limitation in operation at high temperatures. Specifically, "miniaturization" (minimizing the contact surface during braking)
And the complex arrangement for completely and reliably returning the lining to the non-contact position under all circumstances prevents heat dissipation. If the brake system overheats, the braking operation will fluctuate greatly.In addition, the liquid in the liquid pipe will boil and the sealing state between the liquids may be destroyed, shortening the life of the brake system. And other problems arise.

In order to solve the above-mentioned problems, some disk brake systems in which all components are made mechanical have been tried. As a known configuration of this mechanical disc brake system, a caliber installed in a fixed state is used, and a cable connected to the caliper is operated by a braking lever attached to a handlebar. I have. Then, the lining is pressed against the disc by rolling a few balls arranged on the inclined track.

This mechanical disc brake system also has various disadvantages. Since the caliper is installed in a fixed state, the caliper cannot return to the center position naturally during braking. This will cause unnecessary friction when the lining is in the non-contact position.

[0012] Further, the ball has a very small contact surface with the surroundings, so that a ball is scratched on an inclined track. As a result, a few braking operations will increase the friction so much that the braking system does not work properly.

Further, there is a problem that such a mechanical disc brake system is inferior to a hydraulic disc brake system in terms of braking force.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to provide an inexpensive, simple structure.
An object of the present invention is to provide a braking system for a bicycle which has a strong braking force, is highly reliable, and is easy to assemble and maintain.

[0015]

According to a first aspect of the present invention, there is provided a bicycle brake system of a disk brake type, comprising: a disk mounted on a hub and a disk mounted on a fork. And a brake unit with two brake linings, wherein at least one of the discs and the brake unit are mounted in a floating state so as to be able to slightly move in the axial direction relative to each other. The brake lining of the brake unit is mechanically moved by a cam mechanism.

According to the above configuration, at least one of the discs and the brake unit are mounted in a floating state so as to be able to slightly move in the axial direction relative to each other. The disc can move slightly in the axial direction. As a result, pressure is evenly applied to the disc by the brake lining, so that an effective and completely balanced braking operation can be performed.

Also, when the braking operation is released and the brake lining returns to the non-braking position, the brake unit and the disk can slightly move in the axial direction. This allows the disc to be located away from the brake lining, thus minimizing sliding friction.

Further, according to the above configuration, since the brake lining of the brake unit is mechanically moved by the cam mechanism, it is possible to solve various problems that have occurred in the hydraulic disc brake.

According to a second aspect of the present invention, in the bicycle brake system according to the first aspect, the hub and the disk are connected to each other by engagement of a plurality of splines formed respectively. .

According to the above configuration, since the hub and the disk are connected by the meshing of a plurality of splines formed respectively, the hub and the disk are compared with the conventional configuration in which the hub and the disk are connected by screws. As a result, the load associated with braking can be more efficiently distributed.

Further, for example, in a spoke replacement operation during a race, the tire can be more easily and quickly attached and detached as compared with the conventional configuration.

According to a third aspect of the present invention, in the bicycle brake system according to the second aspect, an O-ring for assembling the disc and the hub in a floating state is attached to the spline in the hub. It is characterized by.

According to the above configuration, since the O-ring for assembling the disk and the hub in a floating state is attached to the spline in the hub, the relative position of the disk and the hub in the axial direction is slightly moved. It is possible to adopt a configuration capable of performing such operations.

According to a fourth aspect of the present invention, there is provided a bicycle brake system according to the first aspect, wherein the brake unit is provided with a pin having an O-ring for assembling the brake unit and the fork in a floating state. It is characterized by being attached to the fork.

According to the above construction, the O for assembling the brake unit and the fork in a floating state is provided.
Since the brake unit is attached to the fork by the pin with the ring interposed, the relative position in the axial direction between the brake unit and the fork can be slightly moved.

According to a fifth aspect of the present invention, in the bicycle brake system according to the first aspect, the cam mechanism includes a plurality of receiving seats disposed at positions facing each other, and cam portions respectively connected to the receiving seats. Are formed in the hollow member and the receiving seat and the cam portion, respectively,
Rollers are rolled in the receiving seat and the cam portion, and in a mechanical operation at the time of braking, a roller disposed so that its position does not change with respect to the brake unit, and in cooperation with the hollow member. And a screw connected thereto, wherein the screw rotates the hollow member, and the cam portion slides on the roller, whereby the brake lining is moved.

According to the above arrangement, since the screw rotates the hollow member and the cam slides on the roller to move the brake lining, the conventional brake lining arranged on the inclined track is used. Rolling individual balls can significantly reduce the rolling resistance of the rollers (balls in conventional configurations) as compared to mechanical disc brake systems that press the lining against the disc. This is because the roller in the present invention has a larger contact surface with the periphery than the ball in the conventional configuration, so that the occurrence of scratches during rolling of the ball, which has occurred in the conventional configuration, is greatly reduced. Because you can do it.

According to a sixth aspect of the present invention, in the bicycle brake system according to the fifth aspect, the hollow member moves the brake lining via a piston rotatably housed inside the hollow member. It is characterized by.

According to the above configuration, since the piston for moving the brake lining is rotatably housed inside the hollow member, sliding friction may occur between the contact surface of the piston and the brake lining. Absent. As a result, it is possible to prevent wear on the contact surface between the brake lining and the piston.

According to a seventh aspect of the present invention, there is provided the bicycle brake system according to the first aspect, wherein the brake lining is provided so that when the braking operation is released, the brake lining returns to the non-braking position. It is characterized in that a return spring housed in a groove formed in the brake lining acts.

According to the above configuration, the brake lining is configured to surely return to the non-braking position by the return spring when the braking operation is released, so that the disc and the brake unit are relatively positioned with respect to each other. Due to the synergistic effect of being mounted in a floating state so as to be able to move slightly in the axial direction, sliding friction between the brake lining and the disc during non-braking operation can be minimized.

According to an eighth aspect of the present invention, there is provided a bicycle brake system according to the fifth aspect, wherein one end is connected to the brake cable, and the other end is connected to the brake unit by the screw. It is characterized by having a control lever.

According to the above configuration, one end is connected to the brake cable, and the other end is provided with the control lever connected to the brake unit by the screw. By connecting the brake cable to a conventionally used normal brake lever attached to the handle of the bicycle, the brake system can be easily replaced.

According to a ninth aspect of the present invention, there is provided a bicycle brake system according to the eighth aspect, wherein an adjustment nut is provided so as to surround the screw so that the position of the control lever can be adjusted by an adjustment nut. A return spring is provided.

According to the above configuration, since the adjusting return spring provided so as to surround the screw is provided,
By moving the position of the control lever relative to the adjustment nut, the position of the control lever can be adjusted. By this position adjustment, a desired type of braking can be set.

According to a tenth aspect of the present invention, in the bicycle brake system according to the first aspect, a pivot pin having a through hole is rotatably provided on the brake unit. The through hole penetrates the brake cable and restricts movement of a coating covering the brake cable.

According to the above arrangement, the pivot pin having the through hole is rotatably provided on the brake unit, and the brake cable passes through the through hole in the pivot pin. Even if the direction in which the brake cable moves during the braking operation changes, the turning pin turns following the direction. Thereby, the occurrence of friction between the brake cable and the pivot pin can be suppressed.

Further, since the rotation pin restricts the movement of the coating covering the brake cable, it is possible to prevent the movement of the brake cable from being transmitted to the brake unit properly due to the movement of the coating. .

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

Referring to FIGS. 1 and 5, the disc 1 has a countersunk hole, a hole 2 for lightening, and is made of steel having a high coefficient of friction. Is preferred. This disk 1
It is necessary that a polishing process and an inspection of an accurate flatness be appropriately performed. Also, this disk 1 has bolts 3
Are connected to a star-shaped disk holding portion 4 or a flange portion (in FIG. 1 and FIG. 5, provided with five spokes).

The disc holding section 4 has a hole formed at the center thereof, and is preferably made of a reinforced aluminum alloy. Splines 6 are formed on the inner surface of the hole. The splines 6 are complementary meshed with splines 7 formed on the outer surface at the end of the hub 8 (see FIG. 6). The gasket 5 is preferably made of an O-ring shaped rubber for providing a clearance between the gasket 5 and the disk 1, and is provided in contact with the splines 7 in the hub 8. Also, the splines 7 in the hub 8 are provided with sheets 9 that abut against metal rings 10 provided on the splines 6 in the disc holding part 4 in order to support the disc 1.

The hub 8 has, at both ends thereof, two cylindrical members 11 and 11 shaped to be inserted into concave receiving portions formed at the two tips of the fork 12 of the bicycle. The fixing of the hub 8 to the fork 12 is performed by manually operating the lever means 13, 13 'as conventionally performed.

The brake unit 15 indicated by the reference numeral 15 is shown as an exploded view in FIG. The brake unit 15 includes a caliper formed by an outer caliper body portion 16, and the caliper is disposed at a position outside the disc 1. The outer caliper body 16 has two through holes 18 for receiving the tips of the two pins 17 respectively.
Are formed (see FIG. 5). This pin 17 ・ 17
Are held inside the through holes 18, 18,
An O-ring is provided for connection in a floating state. The other ends of the pins 17 pass through holes formed in the fork 12 and are fixed by nuts.

The outer caliper body 16 is provided with a hollow pedestal 105, in which a screw 19 locks the control lever 20 with an adjustment nut 30. Further, an adjusting return spring 100 is inserted so as to surround the screw 19. Thereby, the position of the control lever 20 is adjusted by moving the position of the control lever 20 with respect to the adjustment nut 30. By this position adjustment, a desired type of braking can be set.

The control lever 20 is provided with a groove 21. A cable 22 (see FIG. 1) connected to a brake lever (not shown) attached to the handlebar is attached to the groove 21. I have. The terminal end of the cable 22 is
Has been fixed by.

The outer caliper body 16 has
A through-hole for a pin is provided for passing the rotation pin 23 for fixing the coating. The pivot pin 23 is stopped at its bottom by an open snap ring 24 (see FIG. 4), whereby the pivot pin 23 is rotatable with respect to the penetrated pin hole.

The rotation pin 23 is connected to the cable 22
Is provided with a through hole 25 through which a cable 55 covering the cable 22 is stopped at one end of the pivot pin 23.

The adjusting return spring 100 provided so as to surround the screw 19 is surrounded by a dust guard 31. The dust guard 31 is preferably made of rubber or synthetic resin.

An inverted T-shaped hollow member 32 having a configuration in which a cylindrical member is combined with a dish-shaped base member is disposed inside the outer caliper body portion 16. This hollow member 3
The two bases are provided with two receiving seats 33, 33 for receiving the two rollers 34, 34, respectively (only one roller 34 and the receiving seat 33 are shown in FIG. 4). It is formed in the position. The positions of the two rollers 34 are fixed to the outer caliper body 16. The two receiving seats 33, 33 have inclined surfaces inclined in opposite directions, and are connected to two cam portions 35, 35 arranged at positions facing each other (in FIG. 4, Only one cam portion 35 is shown).

When a brake lever provided on the handlebar is operated, the control lever 20 is moved by pulling the cable 22, and accordingly, the screw 19 and the hollow member 32 connected thereto are moved. Rotates. Thus, the hollow member 32 is rotated, and the two cam portions 35, 35 are slid by the rollers 34, 34, whereby the hollow member 32 is pushed down to the side where the disk 1 is disposed.

Inside the hollow member 32, a small piston 3
6 is inserted in a rotatable state. The small piston 36 descends together with the hollow member 32 without rotating, abuts against the outer brake lining 37, and brings the outer brake lining 37 closer to the surface of the disk 1. As described above, since no sliding friction occurs between the contact surface of the small piston 36 (which is rotatable with respect to the hollow member 32) and the outer brake lining 37, the outer brake lining 37 and the small piston 36 Wear of the contact surface can be prevented.

The outer brake lining 37 is inserted into a special receiving seat provided in the outer caliper body portion 16. Then, when the brake operation is released, the outer brake lining 37 is returned by the return spring 38 for returning the outer brake lining 37 to the non-braking position.
7 is held in the above-mentioned receiving seat.

The inner brake lining 40, which is maintained in a fixed position, is fixed to the inner caliper body 41 by a stop spring 39. The inner caliper body 41 is firmly connected to the outer caliper body 16 by bolts 42 and nuts 43.

When the small piston 36 presses the outer brake lining 37 against the disk 1, the brake unit 15 and the fork 12 and the disk 1 and the hub 8 are connected in a floating state. As a result, the brake unit 15 and the disk 1 slightly move in the axial direction. Thereby, the pressure is applied to the disc 1 by the outer brake lining 37 and the inner brake lining 40 so that an effective and perfectly balanced braking operation is performed.

When the braking operation is released, the outer brake lining 37 is returned to the non-braking position by the spring force of the return spring 38. Then, in the same manner as above, between the brake unit 15 and the fork 12,
The brake unit 15 and the disk 1 slightly move in the axial direction because the and the hub 8 are connected in a floating state. Thereby, the disc 1 is arranged at a position completely equidistant from the outer brake lining 37 and the inner brake lining 40 so as to minimize sliding friction.

The above description clearly illustrates the effects and advantages provided by the bicycle brake system according to the present invention, which is mounted in a floating state and which is completely mechanically operated by twin cams.

[0057]

As described above, the bicycle brake system according to the first aspect of the present invention is a bicycle brake system of the disc brake type, wherein the disc mounted on the hub and the two brake linings mounted on the fork. Wherein the at least one disc and the brake unit are mounted in a floating state so as to be able to slightly move in the axial direction relative to each other, and the brake unit in the brake unit is provided. The brake lining is configured to be moved mechanically by a cam mechanism.

Thus, the brake unit and the disk can slightly move in the axial direction. Accordingly, the pressure is evenly applied to the disc by the brake lining, so that an effective and completely balanced braking operation can be performed.

Also, when the braking operation is released and the brake lining returns to the non-braking position, the brake unit and the disk can slightly move in the axial direction. As a result, since the disc is arranged away from the brake lining, there is an effect that sliding friction can be minimized.

Further, since the brake lining in the brake unit is mechanically moved by the cam mechanism, it is possible to eliminate various problems that have occurred in the hydraulic disc brake.

A bicycle brake system according to a second aspect of the present invention is configured such that the hub and the disk are connected by meshing a plurality of splines formed respectively.

Thus, in addition to the effect of the configuration of the first aspect, the load associated with braking can be more efficiently distributed as compared with the conventional configuration in which the hub and the disk are connected by screws. It works.

In addition, for example, in a spoke replacement operation during a race, there is an effect that the attachment and detachment of the tire can be performed more easily and quickly as compared with the conventional configuration.

A bicycle brake system according to a third aspect of the present invention is configured such that an O-ring for mounting the disc and the hub in a floating state is attached to the spline in the hub.

Thus, in addition to the effect of the structure of claim 2, there is an effect that the structure can be made such that the axial relative position between the disk and the hub can be slightly moved.

In a brake system for a bicycle according to a fourth aspect of the present invention, the brake unit is attached to the fork by a pin having an O-ring interposed for assembling the brake unit and the fork in a floating state. Configuration.

Thus, in addition to the effect of the first aspect, an effect is obtained that the relative position in the axial direction between the brake unit and the fork can be slightly moved.

According to a fifth aspect of the present invention, in the bicycle brake system, the cam mechanism is a hollow member having a plurality of receiving seats arranged at positions facing each other, and a cam portion connected to each of the receiving seats. And are respectively housed in the receiving seat and the cam portion, are rolled in the receiving seat and the cam portion, and are arranged so that their positions do not change with respect to the brake unit in a mechanical operation during braking. And a screw connected to interlock with the hollow member. The screw rotates the hollow member, and the cam portion slides on the roller to move the brake lining. Configuration.

Thus, in addition to the effect of the configuration of claim 1, the conventional two-sided arrangement on the inclined track
By rolling the three balls, the rolling resistance of the roller (the ball in the conventional configuration) can be significantly reduced as compared with a mechanical disc brake system in which the lining is pressed against the disc.

A bicycle brake system according to a sixth aspect of the present invention is configured such that the hollow member moves the brake lining via a piston rotatably accommodated inside the hollow member.

Thus, in addition to the effect of the fifth aspect, no sliding friction occurs between the contact surface of the piston and the brake lining, so that the contact surface of the brake lining and the piston is worn. This has the effect that it can be prevented.

According to a seventh aspect of the present invention, in the bicycle brake system, the brake lining is formed on the brake lining so that the brake lining is reliably returned to the non-braking position when the braking operation is released. This is a configuration in which a return spring housed in the groove acts.

Thus, in addition to the effect of the first aspect, a synergy with the fact that the disk and the brake unit are assembled in a floating state so as to be able to slightly move in the axial direction relative to each other. By effect
This has the effect of minimizing sliding friction between the brake lining and the disc during non-braking operation.

The bicycle brake system according to the present invention has a control lever having one end connected to the brake cable and the other end connected to the brake unit by the screw. Configuration.

Thus, in addition to the effect of the configuration of claim 5, for example, by connecting the brake cable to a conventionally used normal brake lever attached to the handle of the bicycle, There is an effect that the brake system can be replaced.

According to a ninth aspect of the present invention, there is provided a bicycle brake system including an adjustment return spring provided so as to surround the screw so that the position of the control lever can be adjusted by an adjustment nut. Configuration.

Thus, in addition to the effect of the configuration of claim 8, the position of the control lever can be adjusted by moving the position of the control lever with respect to the adjustment nut. This position adjustment has an effect that a desired braking type can be set.

In a brake system for a bicycle according to a tenth aspect of the present invention, a pivot pin having a through hole is rotatably provided in the brake unit, and the through hole in the pivot pin is connected to a brake cable. And the movement of the coating covering the brake cable is restricted.

Thus, in addition to the effect of the first aspect, even if the direction in which the brake cable moves during the braking operation changes, the rotation pin rotates following the direction. This has the effect of suppressing the occurrence of friction between the rotating pin and the rotating pin.

Further, since the rotation pin restricts the movement of the coating covering the brake cable, it is possible to prevent the movement of the brake cable from being transmitted to the brake unit properly due to the movement of the coating. This has the effect.

[Brief description of the drawings]

FIG. 1 is a front view showing a schematic configuration of a bicycle brake system according to an embodiment of the present invention.

FIG. 2 is a side view showing a schematic configuration of the bicycle brake system shown in FIG.

FIG. 3 is an enlarged view showing a region surrounded by a circle in FIG. 2 in an enlarged manner.

FIG. 4 is an exploded view of a brake unit provided in the bicycle brake system.

FIG. 5 is a perspective view showing a state in which the brake unit and a disk are connected.

6 is a perspective view schematically showing a hub connected to the disk shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk 4 Disk holding part 5 Gasket 6.7 spline 8 Hub 12 Fork 15 Brake unit 16 Outer caliper body part 17 Pin 19 Screw 20 Control lever 22 Brake cable 23 Rotating pin 25 Through hole 32 Hollow member 33 Receiving seat 34 Roller 35 Cam part 36 Small piston 37 Outer brake lining 38 Return spring 40 Inner brake lining 55 Coating 100 Return spring for adjustment

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 598145990 VIA DELL'ASSUNTA 8, 20141 MILANO, ITALLY

Claims (10)

[Claims] 1. A disc brake type bicycle brake system, comprising: a disc mounted on a hub; and a brake unit mounted on a fork and having two brake linings, wherein at least one of the disc and the brake is provided. The units are mounted in a floating state so as to be able to slightly move in the axial direction relative to each other, and the brake lining in the brake unit is
A bicycle brake system characterized by being mechanically moved by a cam mechanism. 2. The bicycle brake system according to claim 1, wherein the hub and the disk are connected by meshing a plurality of splines formed respectively. 3. The bicycle brake system according to claim 2, wherein an O-ring for assembling the disc and the hub in a floating state is attached to the spline in the hub. 4. The brake unit according to claim 1, wherein the brake unit is attached to the fork by a pin having an O-ring interposed for assembling the brake unit and the fork in a floating state. Bicycle brake system. 5. The cam mechanism includes: a plurality of receiving seats arranged at positions facing each other; a hollow member having a cam portion connected to the receiving seats; and a housing accommodated in the receiving seat and the cam portion, respectively. The roller is rolled at the receiving seat and the cam portion, and is interlocked with the roller disposed so that its position does not change with respect to the brake unit in a mechanical operation during braking, and the hollow member. The bicycle according to claim 1, wherein the brake lining is moved by the screw rotating the hollow member and the cam portion sliding on the roller. For brake system. 6. The brake system for a bicycle according to claim 5, wherein said hollow member moves said brake lining through a piston rotatably housed inside said hollow member. 7. A return spring housed in a groove formed in the brake lining acts on the brake lining so as to surely return the brake lining to the non-braking position when the braking operation is released. The brake system for a bicycle according to claim 1, wherein: 8. The control device according to claim 5, further comprising a control lever having one end connected to the brake cable and the other end connected to the brake unit by the screw. Bicycle brake system. 9. The apparatus according to claim 8, further comprising an adjusting return spring provided so as to surround the screw so that the position of the control lever can be adjusted by an adjusting nut. Bicycle brake system. 10. A rotating pin having a through hole is rotatably provided on the brake unit. The through hole in the rotating pin penetrates the brake cable and connects the brake cable. 2. The bicycle brake system according to claim 1, wherein the movement of the covering is limited.